I've always been a bit frustrated when trying to find menhirs and other antiquarian goodness close to places I am visiting. Thus far I've used a combination of books (like Julian Cope's amazing Modern Antiquarian) and websites (like the associated themodernantiquarian.com), both of which are rather clunky in their own way. Books are naturally limited when plotting wilderness locations, and website interfaces are clunky and useless in the field when you've got no data connection. Both are equally bad at showing you what's in, say, 30 minutes of a place you're visiting.
However, I recently discovered that themodernantiquarian.com now offers a set of tools which can be used with Google Earth. So it's now possible to put in a postcode of a place you're going to, and see what's in the surrounding area. Joy! Now, like rats, you know you're never more than X number of miles from a megalith.
Nine Ladies stone circle in Derbyshire. This is a shot from a reel of analogue film I've just got back. More coming soon.